Greetings, aspirant!

Many colleges all over the world offer BTech in aerospace engineering. You should start by checking the universities that you wish to get an admission in and whether the fee structure suits you because the fees for UG courses in most top tier universities is extremely high going up to 30-50L INR.

After finding the university of your preference, you should check for the eligibility criteria. Most of these universities require a candidate to take certain examinations such as SATs or IELTS (if coming from a non English speaking country) and obtain a certain minimum score.

Then comes the application stage where you apply for the programmes offered by the Universities you've chosen and according to the instructions provided by them, submit the necessary documents including Letter of recommendations, passport copies, school transcripts etc.

The payment of fees and such is done online for every semester as per the instructions of the University.

You can also look for scholarships and fee exemptions as many such Universities provide scholarships to its students.

The most important part of the process would be to start your research today itself.

Hope this information helps

Best of luck!!